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WI TNEEEEEI (No Model.) 2 Sheets-Sheet 1. 0. DROGERS. METHOD OF DIVIDING RODS OP METAL AND AT THE SAME TIME POINTING AND THREADING THE ADJACENT ENDS THEREOF.

No. 429,388. Patented June 3, 1890.

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METHOD OF DIVIDING R'ODSOF METAL AND AT THE SAME TIME POINTING AND THREADING THE ADJACENT ENDS THEREOF.

No. 429,388.- Patented June 3, 1890.

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I CHARLES D. ROGERS, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE AMERICAN SCREW COMPANY, OF SAME PLACE.

METHOD OF DIVIDING RODS OF METAL AND AT THE SAME TIME POINTING AND THREADING THE ADJACENT ENDS THEREOF.

SPECIFICATION forming part of Letters Patent No. 429,388, dated June 3, 1890.

Application filed March 31, 1883- Serial No. 269,107. (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES D; ROGERS, a citizen of the United States, residing at Provideuce, in the county of Providence and State of Rhode Island, have invented certainnew' and useful Improvements in the Method of Dividing a Rod of Metal and at the Same Time Pointing and Screw-Threading the Adjacent Ends Thereof; and I do hereby declare the into two pointed sections, each point portion having a screw-thread impressed therein by the same operation. 2 5 My present application is a continuation of the one just referred to; and it consists of the method or process embodied therein but not claimed.

I am aware that rods have heretofore been divided transversely by passing them between moving dies, which reduce and elongate the portion of the stock acted upon. My improvement upon'such former methods resides in rolling or impressing a flattened V-shaped groove into and around the periphery of the rod at the point where it is to be severed, the continuation of the rolling operation also impressing a helical groove or screw-threadinto the contiguous surfaces of the circumferential V-shaped groove, and then severing the rod, thereby simultaneously producing from one rod two shorter rods, each having ascrewin g and screw-cuttin g operations as commonly practiced in the manufacture of the larger sizes of wood-screws, coach-screws, &c.

In order to illustrate my improved method of producing two contiguous screw-threaded cone-shaped points upon a rod at one operation,-I have prepared the accompanying'two sheets of drawings, in which Figure 1, Sheet 1, represents a plan view of a machine embodying said method. Fig. 2 is an enlarged plan view showing the form and arrangement of the dies. Fig. 3, Sheet 2, is

a face view of one of the dies, the other being reversely arranged and indicated by dotted lines, showing a rod headed at each end in position to be acted upon by the dies. Fig. 4 is a transverse sectional view taken through the dies, showing their relation to the rod immediately preceding their action upon it. Fig. 5 is a similar view, the dies having been advanced, thereby forming the rolled cone- 7 shaped peripheral groove in the center of the rod and a consequent lengthening of the same. Fig. 6 is a similar viewof the parts, showing the action of the dies upon the rod at the termination of their work, thereby simultaneously producing ascrew-thread upon each of thecontiguous points and practically severing the rod. Fig. 7 is a partial transverse sectional view taken on line 3 s, Fig. 3, through the V-shaped reducing portion of one of the dies. Fig. 8 is a similar view of the die, taken through the first or enteringportion of the thread forming part of the die on line 0 0; and Fig. 9 is a sectional view of the same, taken on line a: w, showing the progressive forming of the screw-thread.

In carrying out my improvements I employ two oppositely mounted and operated dies A, each having an ungrooved projection D on its face, the shape of which closelyapproximates a half-pyramid out longitudinally through its major axis. This portion of the die serves to impress a correspondingly-shaped peripheral groove into the metal 'rod to be acted upon, thereby obviously lengthening the rod somewhat, as clearly shown in Figs. 4 and 5, the former figure showing a rod at having a head It at each end, the latter figure representing the rod after the V-shaped groove is impressed therein. The highest part of the to;

die D is about equal to the semi-diameter of the rod. D indicates the thread-forming or grooved portion of the die, the same being a continuation of the nngrooved portion D. The cross-sectional form or contour of the grooved die, excepting the grooves and ribs, is the same throughout its length, the sides of the die at the point of intersection forming the longitudinal ridge or apex e. The grooves 25 are cut obliquely into the sides of the die so as to produce ribs narrow at their commencement, where they join the ungrooved portion, which gradually increase in width to form the desired size of thread, as common to rolling screw-threads. In the drawings, Fig.1, I have represented the main dies A connected each with a crank m by means of a link 7', 0 indicating the driving-shafts. The dies are mounted in frames E, plates or gibs f serving to mainof the dies next gradually impress the ribs of the grooved portion into the periphery of the two cones or pointed portions of the rod, when at the termination of the stroke the dies will have simultaneously impressed a screwthread into each half of the rod and severed it, substantially as shown in Fig. 6. The blanks thus provided with a screw-threaded point may be next fully threaded and finished, as usualthat is, by submitting them to the action of the dies of a bolt or screw cutting machine. The screw threaded point serves as a leader in automatically guiding the blanks to the main threadingfdies.

In the event of large sizes of wire being used I preferably heat the stock at the point to be operated upon by the combined pointing and threading dies.

By means of my improvement it is apparent that the production of screws or bolts may be greatly increased as compared with the usual method of first pointing each rod singly, then threading the points, and finally screwthreading the stem or body of the bolt.

I claim as my invention- The improvement, substantially as hereinbefore described, in the manufacture of screws or bolts, consisting, first, in suitably preparing the rod of metal, next rolling a plain V- shaped peripheral groove or depression into the rods surface, thereby elongating the rod toward both ends and .nearly severing it, and finally simultaneously rolling a screw-thread on the two adjacent sides of the said V-shaped groove and severing the rod.

In testimony whereof I have aifixed my signature in presence of two witnesses.

CHARLES D. ROGERS.

\Vitnesses:

CHARLES HANNIGAN, JOHN T. HENTHORN. 

